Ensign a



, `@uitrit gisten gatrut @frnV ENSIGN A. BUSIINELL, OF HORICON,WISCONSIN.

Letters .Patent No. 80,805, dated A'ztgust 11, 1868; antevdatefl July18, 1868.

ttt-e tlptnle referat `it im ttm tants patent mit noting putt nt tiptime.

TO ALL WI-IOM IT MAY CONCERN:

Be it known that I, ENSIGN A. BUSIINELL, of Horicon, in the county ot'Dodge, and State of Wisconsin, have invented new and useful Improvementsin Machine for Sharpening Horse-Shoe Galks; and I do hereby declare thatthe following is a full, clear, and exactfdescrption, which will enableAothers skilled in the art tov which my invention -appertains to makeand use the same, reference being had to the accompanying drawings,forming part of this specification, and in which- Figure 1 representsthe sliding-cap or gauge.

Figure 2 represents a perspective view of a portion ofthe machine, withmy improvements attached.

Figure 3 represents the screw for holding and adjusting the spring inplace.

Figures 4 and 5 represent the spring and burr, or cutter, constructed inaccordance with my improvements.

Similar letters of reference indicate corresponding parts in the severalgures.

This invention relates to certain improvements in machines forsharpening horse-shoe'calks, for which Letters Patent were grantedV tome, No. 55,617, and bearing date June I9, 1866. In this patent theAscrew forr adjusting .the spring to the calks passed directly throughthe spring and into themain stock; said spring being slotted for thispurpose, which had a tendency to weaken it to considerable extent. Aset-screw'was also used, passing through the stock, and resting againstthe spring, to prevent the latter from coming in contactwith the burr,thus complicating the parts, and'detracting from the practicabilityrot'the invention. The cutting-edges of the burr were also straight orparallel with lits axis, and required a greater application 'of power tosharpen the calkjhan by the spiral cutters, which constitute myinvention in this particular.l My improvements are designed to o bviatethese diiiiculties, and they consist- First, in attaching a cap,carrying the burr, to the end of the main stock by means of a slot andset-screw, to enable it to be adjusted to the varying lengths of thecalks, and avoidingthe necessity-of slotting the spring.

Second, in constructing a. guide, fitting upon the spring, and having ascrew attached to its upper side,

passing through the mainstock, and adjusted by means of a set-screw; and

Lastly, in forming the cutting-edges of theburr spirally around it tolessen, the power necessary to operate the device.

In the drawings, R represents the cap, having its front end cut out incircular form, leaving two points or curved projections tting over theburr. The cap is slotted longitudinally, and adjusted upon the mainstock to the varying lengths of the calks to` be sharpened, by means ofthe thumb-screw O.

B represents the spring, `consisting of a. wide and dat plate-having anextended handle, whose shankis slightly bent, as shown in iig. 5. Thisspringis adapted to hold the sbarpener against the calk, and secure itin place. Its extended arm is held in place upon the wider side of themain stock, by being passed through a loop, D, having a screw-boltattached to its upper side, and passing throng-h the main stock. Theloop and spring are adjusted bymeans of a thumb-screw, upon the .end ofthe screw-bolt.

E represents my improved burr, whose cutting-edges are arranged in aspiral direction around it, instead of parallel to its axis, wherebyless power is required to operate it in sharpening theY calks.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The slotted adjustable gauge R, and'iloop D, with `the screw-bolt andset-screw, in combination with the solid spring B, main stock and burrE, as herein described for the purpose specified.

ENSIGN A. BUSHNELL.` l

Witnesses: HIRAM BARBER, AUGUST WAGENER.

